It will work under SteamVR plugin making compatible with the Oculus Rift CV1 and HTC Vive.

My question is:

How can I setup FMOD to detect any of those connected headsets while VR Previewing or under packaged build? I have writen “Rift Audio” under “Initial Output Driver Name” and its working but only with Oculus Rift CV1 headset. It seems that only allows one device seted on it. Im looking to have the ability that Unreal Engine 4 detects automatically any of those connected headsets and work straight forward.

By default, we will use the system default output device. You can manually override this in the FMOD UE4 settings, or you can set it at runtime which will allow you to detect multiple devices.
You will need to iterate through the list of devices to find the one you want to use, then set the driver to be the output. Something along the lines of:

By default, we will use the system default output device. You can manually override this in the FMOD UE4 settings, or you can set it at runtime which will allow you to detect multiple devices.
You will need to iterate through the list of devices to find the one you want to use, then set the driver to be the output. Something along the lines of: